Question

Mass of one atom of an element is 8 x 10-24 g.
This is equal to
(1) 4.8 u
(2) 48 u
(3) 0.048 u
(4) 0.48 u​

Answer 1

Answer:

4.8amu

Explanation:

Firstly,convert 8 × 10^-24g into kilogram by dividing it by 1000

We will get 8 × 10^-27 kg

As it is known: 1u equals 1.66 × 10^-27 kg

so,divide the 8  × 10^-27 by 1.66 × 10^-27

It will equals : 4.8u or it can be written as 4.8 amu

The answer will be 4.8 u

Answer 2

Answer:

The mass of one atom of an element is equal to 4.8amu or 4.8u.

Therefore the option (1) is correct.

Explanation:

• The mass of one -twelfth of carbon-12's mass  is equal to one atomic unit.

• It is represented as 'a.m.u.' or sometimes simply 'u'.  One atomic unit is the average of rest mass of protons as well as the rest mass of neutrons.
• One atomic mass unit or amu is equal to 1.67×10⁻²⁷Kg or 1.67×10⁻²⁴grams.

Given, one atom of an element has mass = 8 x 10⁻²⁴g

   1.67×10⁻²⁴grams of an element is $=1amu$

   8 x 10⁻²⁴g of same element will be  $= \frac{8*10^{-24}}{1.67*10^{-24}}=4.8amu$

Therefore, the mass of one atom of an element is 4.8amu.